Base-plate for the teeth of ore-washer shafts



( o Model.)

2 G.LAUDER. BASE PLATE FOR THE TEETH 0F ORE WASHER SHAFTS. No. 229,232."Patented May 27, 1 884.

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GEORGE LAUDER, OF PITTSBURG, PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 299,232, dated May 2'7,1884.

Application filed November 26, 1883. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE LAUDER, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Base-Plates for the Teeth of Ore-Washer Shafts; and I dohereby declare the following to be a full,clear, and exact descriptionthereof.

My invention relates to an improvement in the construction ofbase-plates for securing the teeth of ore-washer shafts.

I will now describe my invention, so that others skilled in the art maymanufacture and use the same, by reference to the accompanying drawings,in which Figure 1 is an elevation of the shaft, showing the teeth andbase-plate attachment. Fig. 2 is a perspective View of one of the teethand a portion of the spiral rib of the base-plate. Fig. 3 is atransverse section of the shaft, showing the base-plate and teeth inelevation. Fig. 4 is a transverse section of a tooth and the base-plate,showing the manner of securing the teeth to the base-plate.

Like letters of reference indicate like parts wherever they occur.

Heretofore it has been customary to form the teeth of ore-washer shaftswith a T- shaped base, and secure them, either with or without bolting,in a longitudinal dovetailed groove in a suitable shoe fastened to theshaft; or they have been made with a flange at the base and bolteddirectly to the shaft. The conveyer thus formed, however, is weak, andthe blades liable to break or become detached from their fastenings.Instead of plates forming the base of the spiral, I use a series of Tbars or plates, these T-bars being curved to conform to the surface ofthe shaft, bolted thereto, and arranged spirally thereon, with thevertical flange projecting at right angles from the base, to form a ribto which the teeth may be secured.

In the drawings, a represents the shaft of the conveyer, around whichare secured the plates or T -bars I), which form the spiral. Theseplates Z: are of T shape, having flanges or ribs 2) projectingvertically or at right angles from the bases. In the ribs 2) arevertical dovetailed slots 0, situated at suitable distances apart, forthe reception of the teeth d. These slots 0 extend into thebase-plate 1) below the surface thereof. I prefer to form the plates insections of such a length that three of them shall make a circuit aroundthe shaft. The

teeth (1 are plates of steel or wrought-iron of suitable thickness, withbeveled edges, so as to conform to the shape of the dovetailed slots 0.When inserted into the slots, the ends of the teeth preferably passbelow the surface of the base-plate b, as at 1, Fig. 4, and are firmlybolted to the projecting rib b by bolts passing through the holes f. Theplates 6, being arranged spirally around the shaft a, and being securelyattached thereto by bolting or in other well-known manner, form a strongand durable base or shoe for the teeth. WVhen the conveyer is inoperation,the strain on the teeth is not onlyin a longitudinal line, butat an angle transversely, the teeth pushing by their edges andtangentially. They are, however, supported against the strain. by theribs 1) and recessed base-plates b. the teeth be broken or loosened fromtheir fastenings, other teeth are easily inserted into their places.

A great advantage of my improvement is that it enables me to use flatpieces of iron or steel for the teeth without preparing them in any way,except by shearing from a sheet to the proper size and shape.

If desired, I can omit either the groove 0 or recess 9, or both.

That I claim as my invention, and desire to secure by Letters Patent, is

1. A base-plate for ore-washer shafts, having a spirally-curvedprojecting flange to which the teeth may be secured, substantially asand for the purposes specified.

2. A base-plate for ore-washer shafts, having a spirally-curvedvertically-slotted flange projecting at right angles from thebase-plate, substantially as and for the purposes specified.

3. A base-plate for ore-washer teeth, having a flange which projects atright angles from the base-plate, said flange having a transverse toothslot or groove at right angles to and extending into the base-plate,substantially as and for the purposes specified.

4.. A base-plate for ore-washer shafts, having a spiral curve and of Tform in cross-section, substantially as and for the purposes specified.

In testimony whereof I have hereunto set my hand this 21st day ofNovember, A. D.

GEORGE LAUDER. lVitnesses:

W. B. CORWIN, T. B. KERR.

Should any of

